[Answer] The Darvaza gas crater, also known as the Door to Hell, is a natural gas field in Turkmenistan that is believed to have been burning since ...\u00a0

Step 1 : Introduction to the question "The Darvaza gas crater, also known as the Door to Hell, is a natural gas field in Turkmenistan that is believed to have been burning since ...\u00a0"

...1. 1971
2. 1981
3. 1991
4. 2001

Step 2 : Answer to the question "The Darvaza gas crater, also known as the Door to Hell, is a natural gas field in Turkmenistan that is believed to have been burning since ...\u00a0"

1971:

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